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Summary: Inherited Fields | Ctors | Methods | Inherited Methods

# BufferedWriter

`public class BufferedWriter`
`` `extends Writer` ``

java.lang.Object
↳ | java.io.Writer
| ↳ | java.io.BufferedWriter

Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.

The buffer size may be specified, or the default size may be accepted. The default is large enough for most purposes.

A newLine() method is provided, which uses the platform's own notion of line separator as defined by the system property `line.separator`. Not all platforms use the newline character ('\n') to terminate lines. Calling this method to terminate each output line is therefore preferred to writing a newline character directly.

In general, a Writer sends its output immediately to the underlying character or byte stream. Unless prompt output is required, it is advisable to wrap a BufferedWriter around any Writer whose write() operations may be costly, such as FileWriters and OutputStreamWriters. For example,

     PrintWriter out
       = new PrintWriter(new BufferedWriter(new FileWriter("foo.out")));

will buffer the PrintWriter's output to the file. Without buffering, each invocation of a print() method would cause characters to be converted into bytes that would then be written immediately to the file, which can be very inefficient.

See also:

- `PrintWriter`
- `FileWriter`
- `OutputStreamWriter`
- `Files.newBufferedWriter(Path, Charset, OpenOption...)`

## Summary

### Inherited fields
From class `java.io.Writer`
`protected Object` | `lock` The object used to synchronize operations on this stream.

### Public constructors
`BufferedWriter(Writer out)` Creates a buffered character-output stream that uses a default-sized output buffer.
`BufferedWriter(Writer out, int sz)` Creates a new buffered character-output stream that uses an output buffer of the given size.

### Public methods
`void` | `close()` Closes the stream, flushing it first.
`void` | `flush()` Flushes the stream.
`void` | `newLine()` Writes a line separator.
`void` | `write(int c)` Writes a single character.
`void` | `write(String s, int off, int len)` Writes a portion of a String.
`void` | `write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.

### Inherited methods
From class `java.io.Writer`
`Writer` | `append(char c)` Appends the specified character to this writer.
`Writer` | `append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this writer.
`Writer` | `append(CharSequence csq)` Appends the specified character sequence to this writer.
`abstract void` | `close()` Closes the stream, flushing it first.
`abstract void` | `flush()` Flushes the stream.
`void` | `write(String str)` Writes a string.
`void` | `write(int c)` Writes a single character.
`void` | `write(String str, int off, int len)` Writes a portion of a string.
`abstract void` | `write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.
`void` | `write(char[] cbuf)` Writes an array of characters.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Appendable`
`abstract Appendable` | `append(char c)` Appends the specified character to this `Appendable`.
`abstract Appendable` | `append(CharSequence csq, int start, int end)` Appends a subsequence of the specified character sequence to this `Appendable`.
`abstract Appendable` | `append(CharSequence csq)` Appends the specified character sequence to this `Appendable`.
From interface `java.io.Closeable`
`abstract void` | `close()` Closes this stream and releases any system resources associated with it.
From interface `java.io.Flushable`
`abstract void` | `flush()` Flushes this stream by writing any buffered output to the underlying stream.
From interface `java.lang.AutoCloseable`
`abstract void` | `close()` Closes this resource, relinquishing any underlying resources.

## Public constructors

### BufferedWriter

    public BufferedWriter (Writer out)

Creates a buffered character-output stream that uses a default-sized output buffer.

Parameters
`out` | `Writer`: A Writer

### BufferedWriter

    public BufferedWriter (Writer out,
                    int sz)

Creates a new buffered character-output stream that uses an output buffer of the given size.

Parameters
`out` | `Writer`: A Writer
`sz` | `int`: Output-buffer size, a positive integer

Throws
`IllegalArgumentException` | If `sz <= 0`

## Public methods

### close

    public void close ()

Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

Throws
`IOException` |

### flush

    public void flush ()

Flushes the stream.

Throws
`IOException` | If an I/O error occurs

### newLine

    public void newLine ()

Writes a line separator. The line separator string is defined by the system property `line.separator`, and is not necessarily a single newline ('\n') character.

Throws
`IOException` | If an I/O error occurs

### write

    public void write (int c)

Writes a single character.

Parameters
`c` | `int`: int specifying a character to be written

Throws
`IOException` | If an I/O error occurs

### write

    public void write (String s,
                    int off,
                    int len)

Writes a portion of a String.

If the value of the `len` parameter is negative then no characters are written. This is contrary to the specification of this method in the superclass, which requires that an `IndexOutOfBoundsException` be thrown.

Parameters
`s` | `String`: String to be written
`off` | `int`: Offset from which to start reading characters
`len` | `int`: Number of characters to be written

Throws
`IOException` | If an I/O error occurs

### write

    public void write (char[] cbuf,
                    int off,
                    int len)

Writes a portion of an array of characters.

Ordinarily this method stores characters from the given array into this stream's buffer, flushing the buffer to the underlying stream as needed. If the requested length is at least as large as the buffer, however, then this method will flush the buffer and write the characters directly to the underlying stream. Thus redundant `BufferedWriter`s will not copy data unnecessarily.

Parameters
`cbuf` | `char`: A character array
`off` | `int`: Offset from which to start reading characters
`len` | `int`: Number of characters to write

Throws
`IOException` | If an I/O error occurs

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